Circuit Lake

This project is built to monitors the instantaneous current, voltage, frequency, and real power consumption in home. To monitor voltage, the project uses a dedicated miniature transformer. Current is measured using a home built current transformer that clamps around the incoming power feed. The current transformers are homemade from split ferrite cores with 100 turns into a 0.1 ohm 'burden' resistor. The real power is calculated with an analog multiplier followed by a low pass filter to obtain the DC component (real power).These analog quantities are then fed to a ...

This ATmega168-based project monitors household power usage and logs it to an SD card. Signals from voltage and current detectors amplified LMC6484AIN quad op-amp and then AVR microcontroller computes the power consumption using the formula P=VxI.The voltage and current are each sampled at 9615 Hz so the integration should be fairly accurate even for highly non-sinusoidal loads such as computers or fluorescent bulbs. A graphical LCD shows the power usage as a strip chart and can also act as an oscilloscope to display the voltage and current waveforms. The current ...

This project can transmits phone conversation up to 30 metres (100 feet) to an ordinary FM receiver. You can experiment to get greater transmission range away from the phone line by adding an aerial (about 150 cm of 26 gauge wire) to the collector of T2 (see circuit below).To use phone transmitter, you need to attaches it in series to one of your phone lines. When there is a signal on the line (that is, when you pick up the handset) the circuit will transmit the conversation a short distance. ...

This music player project built based on AT90USB1286 microcontroller. It uses VS1033D music decoder which integrates music file decoding and digital-to-analog output. Other main part including 16x2 character LCD display, ST7066/HD44780 compatible, using 3.3V instead of 5V and DS1307 real time clock.By finishing this project you can understand the communication between the microcontroller, memory, computer, LCD display, RTC, IR remote, and the music file decoder, said Frank, project designer.The project is a simple proof-of-concept music player. It will allow the user to load music as through USB as though it ...